Bug 36766: Add a command-line utility to SFTP a file to a remote server

Bug 36766: Add a command-line utility to SFTP a file to a remote server

To test you need to have a remote server you are authorised to SFTP files to.

Test plan:
1. Apply patch and restart services

2. Generate a file on your Koha server. Place it in /tmp/test.mrc

3. Manually connect to the SFTP remote host and accept the hostkey

4. Enter Koha shell

5. Run the sftp_file.pl command-line script
./sftp_file.pl --host <your remote hostname> --user <your user> --pass <your password> --upload_dir <your upload directory> --file /tmp/test.mrc

6. Confirm the SFTP was successful

Sponsored-by: Horowhenua Libraries, Toi Ohomai Institute of Technology, Plant and Food Research Limited, Waitaki District Council, South Taranaki District Council New Zealand
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>